Those tart little lemons work to remove copper oxide because they contain citric acid. Since lemon juice has the highest concentration of citric acid of any fruit, it works the best.
Vinegar (or Lemon Juice) and Salt This method is the best way to clean your pennies, and it will produce a very bright orangey-copper color on your pennies. It does this by using the low levels of acids that are contained naturally in vinegar and lemon juice to remove the patina (brown oxidation) on the penny.
Copper oxide dissolves in a mixture of weak acid and table salt-and vinegar is an acid. You could also clean your pennies with salt and lemon juice or orange juice, because those juices are acids, too.
Washing the pennies in a vinegar and salt solution removes the patina from the pennies, exposing the brighter copper underneath once more.
Mix 1/2-cup distilled white vinegar (or lemon juice, which is more acidic) with 1 Tbsp. salt and enough flour to form a thin paste. Apply the paste to the copper surface and scrub away the tarnish with a cloth or scrubbing sponge.
Vinegar has a pH level of 3.0, while lemon juice has a pH level of 2.3. This means that lemon juice is a slightly stronger acid than vinegar. The stronger the acid, the better it will clean copper pennies.
Lemon and lime juices contains citric acid, which will dissolve the copper oxide. As a result, the penny is shiny once again.
Pennies get dull and dirty because the copper in the pennies reacts with oxygen in the air to form copper oxide. When you put your pennies in a vinegar and salt mix, the vinegar and salt react together and remove the copper oxide.
The combination of vinegar (a weak solution of acetic acid), and table salt (sodium chloride) helps to dissolve the copper oxide, and also forms the blue copper(II) ion, which is soluble in water. The penny becomes shiny again!
The chemical volcano is a popular science project because it is very easy and yields reliable results. The basic ingredients for this type of volcano are baking soda and vinegar, which you probably have in your kitchen.
Soaking them in Coca-Cola can clean up the coins. The acidic nature of the soda eats away the dirt and rust, leaving a shiny penny. Don’t leave pennies in Coca-Cola for too long, however, or the soda could damage the coins. … Soak pennies for about 24 hours.
Acetic acid– This is perhaps one of the most commonly used materials to clean copper. A lot of people may not know this but acetic acid is readily available in almost every household in the form of vinegar. Though acetic acid is quite weak and not as potent as citric acid, it does the job of clean copper pretty well.
Vinegar and Salt
Rub a mixture of 1 tablespoon of table salt and 1 cup of white vinegar onto the copper with a soft cloth and rinse. Or, immerse the tarnished copper into a pot of 3 cups of water and the salt-vinegar mixture, bring to a boil and boil until the grime and tarnish comes off.
Why it works:
The best way to do this is with an acid and salt. Ketchup contains vinegar, a weak acid, which breaks down the copper oxide on the surface of the penny. … These ions bond with the copper, forming copper chloride. The copper chloride helps the vinegar further break down the copper oxide.
Lemon and Lime juice are both acids. They erode whatever they come in contact with if given the proper amount of time. So don’t leave your coin in the acid for more than 30 minutes or your coins major features will dissolve. Put the acid in the jar along with the coin.
The salt and acetic acid in vinegar do the trick. Hot sauce, like Tabasco or taco sauce, also will remove the oxides off pennies. As in ketchup, salt and vinegar are both in hot sauce. Coke and off-brand colas will quickly remove the tarnish.
The citric acid removes the copper oxide from the penny and rinses away the loosened dirt and grime. The acid is not strong enough to dissolve the copper itself, so all that is left is the clean, shiny copper surface.
Pickle juice is actually a vinegar. The reason pickle juice cleans a penny so well is it contains acetic acid, which breaks down copper oxide. … Those tart little lemons work to remove copper oxide because they contain citric acid.
Vinegar. Acid speeds up the oxidation process taking place on copper. If you submerge a penny in even a relatively mild household acid, such as vinegar, it will start to tarnish. Some people recommend the use of vinegar combined with other ingredients, such as salt, to clean pennies.
Mix 1/4 cup salt, 1/4 cup flour and enough vinegar to make a thick paste. Use a soft cloth to rub the paste on the surface of the copper. Buff the copper item until it shines. Rinse with warm water and dry thoroughly.
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